Nh 1B over Piscataqua Estuary
FairRockingham County, New Hampshire · 1.1 MI from JCT Rt 1A · Structure no. 018100310014200
- Built
- 1955
- 70 years old, rebuilt 2021
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 484 ft
- 9 main spans
- Daily traffic
- 3,041
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Nh 1B over Piscataqua Estuary is a steel continuous stringer/multi-beam or girder carrying Nh 1B over Piscataqua Estuary in Rockingham County, New Hampshire. It was built in 1955 and reconstructed in 2021, so it is 70 years old, older than the New Hampshire average of 56.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 3,041 vehicles a day, roughly 5% of them trucks, projected to reach 4,500 by 2043. The structure is 484 ft (147.5 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nh 1B over Piscataqua Estuary built?
It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2021.
What condition is Nh 1B over Piscataqua Estuary in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.
How much traffic does Nh 1B over Piscataqua Estuary carry?
About 3,041 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is Nh 1B over Piscataqua Estuary?
The structure is 484 ft (147.5 m) long with a longest span of 60 ft (18.3 m) and a deck 34 ft wide.
Who owns Nh 1B over Piscataqua Estuary?
It is owned by the State Highway Agency.